I have downloaded the Windows 10 ISO and installed WinToUSB 3.1 successfully. When trying to use Windows To Go Conversion on the step "Please select the destination disk", my Sandisk Extreme 64GB USB 3.0 SDCZ80-064G-G46 drive dismounts and I receive the following error: Failed to run system API.(0x00320015011F0000). I have to go back into computer management to re-assign the drive and format it before seeing it in My Computer again. I'm running Windows 10 Pro on a Surface Pro 4 with Bitlocker and Windows Defender activated. I have tried turning Windows Defender off, but the same warning continued to appear. The logs are attached. Please advise. Thanks!

(08-12-2016, 12:43 AM)jasaronson Wrote: I have downloaded the Windows 10 ISO and installed WinToUSB 3.1 successfully. When trying to use Windows To Go Conversion on the step "Please select the destination disk", my Sandisk Extreme 64GB USB 3.0 SDCZ80-064G-G46 drive dismounts and I receive the following error: Failed to run system API.(0x00320015011F0000). I have to go back into computer management to re-assign the drive and format it before seeing it in My Computer again. I'm running Windows 10 Pro on a Surface Pro 4 with Bitlocker and Windows Defender activated. I have tried turning Windows Defender off, but the same warning continued to appear. The logs are attached. Please advise. Thanks!

I found a solution to the problem here: https://github.com/pbatard/rufus/issues/802. Take a look at pbatard's first response where it offers a diskpart recommendation. Each step was successful and afterwards I was able to get past the formatting error. Thanks for your help!